Full refactor of codebase

src/repository/lookup.go

@@ -0,0 +1,32 @@
+package repository
+
+import (
+	"errors"
+
+	"github.com/ascyii/qrank/src/utils"
+)
+
+func EnsureUniqueUsernameAndSlug(u *User) error {
+	baseU := u.Username
+	baseS := utils.Slugify(u.Username)
+	for i := range 5 {
+		candU := baseU
+		candS := baseS
+		if i > 0 {
+			suffix := "-" + utils.MustRandToken(1)
+			candU = baseU + suffix
+			candS = baseS + suffix
+		}
+		var cnt int64
+		db.Model(&User{}).Where("username = ?", candU).Count(&cnt)
+		if cnt == 0 {
+			db.Model(&User{}).Where("slug = ?", candS).Count(&cnt)
+			if cnt == 0 {
+				u.Username = candU
+				u.Slug = candS
+				return nil
+			}
+		}
+	}
+	return errors.New("cannot create unique username/slug")
+}